Chain-Driven Belt Replacement Checklist: What to Measure Before You Order
Short answer
Measure chain pitch on the actual chain, chain inner width, rod diameter and rod pitch, overall width and chain centre distance, and how the mesh joins the chain — and photograph the sprockets. Most chain-driven replacement problems come from the chain and sprocket, not the mesh.
01Chain pitch and width
Measure the chain pitch on the chain itself, not from an old order. Chain inner width and roller diameter decide the sprocket.
02Rod and mesh
Rod diameter and rod pitch, spiral wire diameter, and how the mesh reaches the chain — washer welded or cotter pin.
03Sprockets
Sprocket matching starts with photos of tooth count, bore, keyway and wear. Worn sprockets on a new belt shorten its life.
04Checklist
- ✓Old belt photos or a sample section
- ✓Chain pitch and inner width
- ✓Rod diameter and pitch, wire diameter
- ✓Overall width and chain centre distance
- ✓Edge: washer welded or cotter pin
- ✓Sprocket tooth count, bore, keyway, wear
- ✓Load, speed, temperature and cleaning
05Measure, how and why
| Measure | How | Why |
|---|---|---|
| Chain pitch | On the chain itself, over several links | Decides the sprocket |
| Chain inner width and rollers | Caliper | Fit on the sprocket |
| Rod diameter and rod pitch | Caliper and tape | Mesh fits the chain |
| Overall width and chain centre distance | Tape at several points | Belt fits the frame |
| Edge connection | Photo: washer welded or cotter pin | Same joint as the original |
| Sprockets | Tooth count, bore, keyway, wear | New belt on a sound drive |
Want this checked on your belt?
Send photos with a tape in the picture, a drawing or an old belt section.
Belts in this guide
Related guides
Questions Buyers Ask
Q1Can you join a new section to my old belt?
Yes, if overall width or chain centre distance and the chain match — they are checked first.
Q2Do I need new sprockets?
If the old sprockets are worn or the pitch differs, yes. Photos of the teeth tell us.
Q3What if I only have photos?
Photos with a tape or caliper in the picture are a good start; the readings that are still missing are listed back to you before quotation.
Q4Can the chain material differ from the mesh?
Yes. Mesh, rods and chain are each written on the drawing and confirmed per project.